The root cause is Google emulator console behavior change: now you MUST authenticate in emulator console before you can issue 'kill' command. This change was introduced about a week ago when Android SDK 25.1.6 was released.

Otherwise, by default starting with SDK Tools 25.1.6, you need to authenticate
before you can start using the telnet interface. So here we use the documented
way of disabling this feature, i.e. returning to the old behaviour.

SCM/JIRA link daemon
added a comment - 2016-05-23 17:10 Code changed in jenkins
User: Christopher Orr
Path:
src/main/java/hudson/plugins/android_emulator/AndroidEmulator.java
src/main/java/hudson/plugins/android_emulator/EmulatorConfig.java
src/main/java/hudson/plugins/android_emulator/util/Utils.java
http://jenkins-ci.org/commit/android-emulator-plugin/98f6b8cdc0e389cd9fe5fbed34ec4e53e52c199a
Log:
[FIXED JENKINS-35004] Disable console auth token at startup.
Otherwise, by default starting with SDK Tools 25.1.6, you need to authenticate
before you can start using the telnet interface. So here we use the documented
way of disabling this feature, i.e. returning to the old behaviour.

Otherwise, by default starting with SDK Tools 25.1.6, you need to authenticate
before you can start using the telnet interface. So here we use the documented
way of disabling this feature, i.e. returning to the old behaviour.

SCM/JIRA link daemon
added a comment - 2016-05-23 17:13 Code changed in jenkins
User: Christopher Orr
Path:
src/main/java/hudson/plugins/android_emulator/AndroidEmulator.java
src/main/java/hudson/plugins/android_emulator/EmulatorConfig.java
src/main/java/hudson/plugins/android_emulator/util/Utils.java
http://jenkins-ci.org/commit/android-emulator-plugin/31c1582fea973e5ab530f188b7f360c261b8d4ef
Log:
[FIXED JENKINS-35004] Disable console auth token at startup.
Otherwise, by default starting with SDK Tools 25.1.6, you need to authenticate
before you can start using the telnet interface. So here we use the documented
way of disabling this feature, i.e. returning to the old behaviour.